Nonwoven Fabric Studies

Michie, R. I. C.

doi:10.1177/004051756303300601

Cited by 9 publications

(3 citation statements)

References 2 publications

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“…Grouping of the measurements of curl factor and orientation on the fiber segments is unnecessary; each one is used individually. The results from six fahrics are demon- In a previous experiment described by Michie [5], the zero jaw-span test had been carried out on several nonwovens.…”

Section: Comparison Of Theory and Experimentsmentioning

confidence: 99%

Nonwoven Fabric Studies Part XV: The Application of the Fiber Network Theory

Hearle

Newton

1968

Textile Research Journal

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The stress-strain curves of several bonded fiber fabrics have been theoretically determined from measurements of the properties and arrangement of the constituent fibers, and these curves are compared with the measured fabric stress-strain curves. The results demonstrate how the behavior of the fiber network can influence that of the fabric and indicate that the behavior of the binder must be introduced for a complete explanation of the fabric behavior at high strains.

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Section: Comparison Of Theory and Experimentsmentioning

confidence: 99%

Nonwoven Fabric Studies Part XV: The Application of the Fiber Network Theory

Hearle

Newton

1968

Textile Research Journal

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“…Both the influence of single fiber strength and fiber orientation as well as the influence of pressure and temperature in the calendering process have been investigated and modeled in detail in numerous studies. [1][2][3][4][5][6][7][8][9][10][11][12][13][14] It has been shown that the pressure has only a limited influence, [7,[15][16][17][18] whereas the temperature has a significant influence on the strength of nonwovens, whereby for polypropylene, a maximum strength is achieved at temperatures between 140 and 155 C depending on the weight per area, fiber diameter, process speed, and polymer grades used. [7,8,12,19,20] Generally, it is important that a temperature of at least 132 C is reached in the core of the nonwoven, whereas too high average temperatures in the web of over 142 C can lead to delamination of the bonding points or to an increased weakening at the edge of the bonding points.…”

Section: Introductionmentioning

confidence: 99%

“…The mechanical properties depend both on the properties of the filaments and on the bonding of the fibers. Both the influence of single fiber strength and fiber orientation as well as the influence of pressure and temperature in the calendering process have been investigated and modeled in detail in numerous studies . It has been shown that the pressure has only a limited influence, whereas the temperature has a significant influence on the strength of nonwovens, whereby for polypropylene, a maximum strength is achieved at temperatures between 140 and 155 °C depending on the weight per area, fiber diameter, process speed, and polymer grades used .…”

Section: Introductionmentioning

confidence: 99%

Analysis and Modeling of the Influence of the Size and Fraction of Bonding Points onto the Mechanical Behavior of Polypropylene Spunbond Nonwovens

Leucker

Schubert

2019

Adv Eng Mater

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While the influence of fiber strength and calendering parameters on the mechanical strength of polypropylene spunbond nonwovens are investigated extensively, only a few nonsystematic studies are available on the influence of bonding point size and bonding point fraction. Therefore, systematic investigations of the influence of bonding point fraction, bonding point size, and spacing on the tensile properties of nonwovens are conducted. In addition, the influence of fiber orientation and cloudiness on the strength is evaluated. It is demonstrated that an increase in the bonding fraction leads to an increase in stiffness and strength, although this effect is weakened due to fiber damage at the edges of bonding points, when many small bonding points are used. An increase in bonding point size and distance between the points with a constant bonding fraction initially leads to an increase in strength. Only when the distance between the points exceeds, the size of the local nonuniformities the strength decreases again, whereas the stiffness decreases continuously with increasing distance between the bonding points. In addition, it is shown that the stress–strain behavior of nonwovens can be described using a Maxwell model and that the strengths can be modeled using statistical modeling with optically accessible parameters.

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Strengthening of thermally bonded fibre materials fabricated in spinning from polymer melts

Генис

1998

Fibre Chem

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The mechanism of strengthening of fibre materials fabricated by self-adhesive bonding during aerodynamic spinning was investigated. The effect of the structural indexes on the breaking strength of copolyatnide, polypropylene, and pol),cunide fibre materials was assessed. A mixed mechanism of their failure was established. A correlation was found between the structural indexes and the technological parameters of aerodynamic spinning.In aerodynamic spinning of fibre materials from melts, high-temperature stretching of the jet takes place. The fibres formed are transported by air to the take-up device, where they are glued together by the residual heat in them, forming a fibre lap [I].We will use the results obtained in studying glued nonwoven materials to assess the effect of structural elements on the physicomechanical properties of fibre lap. The structure of glued nonwoven materials and the arbitrary separation of these materials as a function of the degree of gluing into weakly, moderately, and strongly glued were qualitatively evaluated based on an znalysis of the deformation curves in [2]. It was hypothesized in [ 1,[3][4][5] that the least strong structural elements break more frequently in real fibre materials: the adhesive joints in weakly glued materials and the fibres in strongly glued materials.At the same time, a mixed mechanism of fracture of the materials was also hypothesized. In this case, both fibres and adhesive joints fracture. These hypotheses are based on the results of a study of models of nonwoven materials constructed from wires [4] with different elastic properties than the polymer fibres and on elementary models consisting of several glued fibres simulating glued nonwoven materials [6].The results of the study suggest the existence of two main ways of increasing the strength of fibre materials: due to an increase in the number of adhesive joints in the lap with a simultaneous decrease in the distance between them, or due to an increase in the strength of the individual adhesive joint with simultaneous preservation of a sufficient distance (300-400 lain) between adhesive joints. It should be noted that the strength of fibre materials fabricated by high-temperature stretching of polymer jets with subsequent thermal bonding is a function of the spinning conditions [2] and factors related to the structure of the fibre lap. The mechanism of strengthening differs significantly from the mechanism of the strength of materials fabricated by aerodynamic spinning of "cold" fibres not glued in the lap, which we investigated in detail in [8].The mechanism of strengthening of polymeric fibre materials fabricated by self-adhesive bonding during aerodynamic spinning is discussed in the present article. Model samples represented by fibre networks consisting of fibres of variable diameter from 50 to 400 pan were investigated in the first stage.The model samples were fabricated by gravity spinning on an OVN-I installation. Spinning and self-adhesive bonding of the fibres in the model materials was attained...

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Nonwoven Fabric Studies

Cited by 9 publications

References 2 publications

Nonwoven Fabric Studies Part XV: The Application of the Fiber Network Theory

Nonwoven Fabric Studies Part XV: The Application of the Fiber Network Theory

Analysis and Modeling of the Influence of the Size and Fraction of Bonding Points onto the Mechanical Behavior of Polypropylene Spunbond Nonwovens

Strengthening of thermally bonded fibre materials fabricated in spinning from polymer melts

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